Ana Tronholm

Ana Tronholm
University of Gothenburg | GU · Department of Biological & Environmental Sciences

PhD

About

31
Publications
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Introduction
My interests cover the areas of algal biodiversity, evolution and genomics. I study patterns of diversification and speciation, mostly on (sub)tropical regions. I am particularly interested in the role of secondary metabolites in algal overgrowth of corals and their bioactivity, and in phenomena of tropicalization, such as HABs, currently taking place in temperate regions that may serve as natural laboratories to detect and predict changes in marine ecosystems in future climate scenarios.

Publications

Publications (31)
Article
Full-text available
Caribbean coral reefs are experiencing a shift to algal dominance at the expense of stony corals. Determining the factors leading to algal phase shifts is crucial for assuring the survival of Caribbean coral reefs. In this study, factors controlling the growth of the abundant brown macroalgae, Dictyota spp. were investigated by varying herbivory pr...
Article
Full-text available
Aim: Historical processes that shaped current diversity patterns of seaweeds remain poorly understood. Using Dictyotales, a globally distributed order of brown seaweeds as a model, we test if historical biogeographical and diversification patterns are comparable across clades. Dictyotales contain some 22 genera, three of which, Dictyota, Lobophora...
Article
Cyanobacteria comprise an extraordinarily diverse group of microorganisms and, as revealed by increasing molecular information, this biodiversity is even more extensive than previously estimated. In this sense, the cyanobacterial genus Lyngbya is a highly polyphyletic group composed of many unrelated taxa with morphological similarities. In this st...
Article
Full-text available
The green plants (Viridiplantae) are an ancient group of eukaryotes comprising two main clades: the Chlorophyta, which includes a wide diversity of green algae, and the Streptophyta, which consists of freshwater green algae and the land plants. The early-diverging lineages of the Viridiplantae comprise unicellular algae, and multicellularity has ev...
Article
Many tropical marine cyanobacteria are prolific producers of bioactive secondary metabolites with ecological relevance and promising pharmaceutical applications. One species of chemically rich, tropical marine cyanobacteria that was previously identified as Symploca hydnoides or Symploca sp. corresponds to the traditional taxonomic definition of Ph...
Article
Full-text available
Sequencing mitochondrial and chloroplast genomes has become an integral part in understanding the genomic machinery and the phylogenetic histories of green algae. Previously, only three chloroplast genomes (Oltmannsiellopsis viridis, Pseudendoclonium akinetum, and Bryopsis hypnoides) and two mitochondrial genomes (O. viridis and P. akinetum) from t...
Article
Full-text available
The control of RNA splicing is often modulated by exonic motifs near splice sites. Chief amongst these are exonic splice enhancers (ESE). Well described ESEs in mammals are purine rich and cause predictable skews in codon and amino acid usage towards exonic ends. Looking across species, those with relatively abundant intronic sequence are those wit...
Article
Full-text available
Seagrasses are among the most productive habitats in the marine realm, performing several crucial physical and biological ecosystem services. One group of seagrasses is the family Zosteraceae, which includes three to four genera and >20 species inhabiting temperate waters of both the northern and southern hemisphere. Species delineation depends on...
Article
Full-text available
The control of RNA splicing is often modulated by exonic motifs near splice sites. Chief amongst these are exonic splice enhancers (ESE). Well described ESEs in mammals are purine rich and cause predictable skews in codon and amino acid usage towards exonic ends. Looking across species, those with relatively abundant intronic sequence are those wit...
Article
Full-text available
We reassessed the taxonomy of dentate Dictyota species formerly attributed to D. ciliolata and D. crenulata. Both taxa have long been assumed to be broadly distributed in tropical to warm-temperate seas. Recent molecular data, however, provided evidence that D. crenulata constituted a complex of at least four species with restricted geographical di...
Article
Full-text available
: Many tropical marine macroalgae are reported from all three ocean basins, though these very wide distributions may simply be an artifact resulting from inadequate taxonomy that fails to take into account cryptic diversity. Alternatively, pantropical distributions challenge the belief of limited intrinsic dispersal capacity of marine seaweeds and...
Data
Full-text available
Genbank accession numbers of the sequences used in the concatenated alignment, including strain numbers and sequence length. (PDF)
Data
Estimates of evolutionary divergence (uncorrected p-distances) between psbA sequences, using unique haplotypes only. Raw data available upon request. (EPS)
Data
Multigene phylogeny. Phylogenetic hypothesis (lnL = −45960.04) obtained by maximum likelihood inference of a dataset containing six genes (partial LSU rDNA, rbcL, psbA, cox1, cox3 and nad1). Numbers at the nodes indicate ML bootstrap values followed by posterior probabilities; values below respectively 50 and 0.7 are not shown. (EPS)
Data
Full-text available
Specimens used in the molecular analyses with indication of collecting data. In the first column, (•) indicates specimens used for the species delimitation analyses and (○) indicates the specimens used for the multigene phylogenetic analyses. (PDF)
Article
Full-text available
Taxonomy of the brown algal genus Dictyota has a long and troubled history. Our inability to distinguish morphological plasticity from fixed diagnostic traits that separate the various species has severely confounded species delineation. From continental Europe, more than 60 species and intraspecific taxa have been described over the last two centu...
Article
Coexistence in a homogeneous environment requires species to specialize in distinct niches. Sympatry of cryptic species is of special interest to both ecologists and evolutionary biologists because the mechanisms that facilitate their persistent coexistence are obscure. In this study, we report on two sympatric Dictyota species, D. dichotoma (Huds....
Article
Full-text available
Although it has been suggested that the distribution of Dictyota dichotoma is probably restricted to the Euro-pean Atlantic Ocean and the Mediterranean Sea, its occurrence in the Canary Islands (new southernmost distribution limit) is confirmed by nuclear ribosomal sequence data (LSU rDNA). Even though D. dichotoma has been described and illustrate...
Article
Full-text available
Twenty-five species of benthic marine algae (five Cyanophyta, fourteen Rhodophyta, and six Chlorophyta) are reported for the first time for the island of El Hierro. Species were collected in the eulittoral and sublittoral in the zone for traditional activities of the ‘Reserva Marina del Mar de Las Calmas’. Data concerning the habitat and the region...

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Project (1)
Project
The overarching goal of this project is to determine how current and future climate scenarios will affect the occurrence, abundance and toxicity of harmful algal blooms, through the development of an innovative and integrative method combining state-of-the-art genomics and chemical approaches.